[Porkchop]

So after the crash was he lights out? Any head trauma or concussion could cause short term memory loss that he may think he blacked out. He probably just doesn't remember...

My brother had an unfortunate incident while involved in a golf cart race, where the back of his head ended up meeting asphalt. He was out for a couple seconds. He was rushed to the hospital. He had a concussion and was puking everywhere. Still to this day he doesn't remember the accident happening, he can only remember about to ten seconds before the accident.